package com.itheima.filter;

import com.itheima.utils.CurrentHolder;
import com.itheima.utils.JwtUtils;
import io.jsonwebtoken.Claims;
import jakarta.servlet.*;
import jakarta.servlet.annotation.WebFilter;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import lombok.extern.slf4j.Slf4j;

import java.io.IOException;

@Slf4j
@WebFilter(urlPatterns = "/*")
public class TokenFilter implements Filter {

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        //1.获取到请求路径
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response= (HttpServletResponse) servletResponse;
        String requestURI = request.getRequestURI();
        //2.判断是否是登录请求,如果路径中包含/login,说明是登录操作,放行请求
        if(requestURI.contains("/login")){
            log.info("登录请求,放行");
            filterChain.doFilter(request,response);
            return;
        }
        //3.获取请求头中的token
        String token=request.getHeader("token");
        //4.判断token是否存在,如果不存在,说明是未登录的请求,返回未登录的响应
    if(token==null||token.isEmpty()){
    log.info("令牌为空,响应401");
    response.setStatus(HttpServletResponse.SC_UNAUTHORIZED);
    return;
}
        //5.如果token存在,校验令牌,如果校验通过,放行请求,如果校验不通过,返回未登录的响应
     try {
            Claims claims =JwtUtils.parseToken(token);
           Integer empId=Integer.valueOf(claims.get("id").toString()) ;
         CurrentHolder.setCurrentId(empId);
         log.info("当前登录员工ID:{},将其存入ThreadLocal",empId);
        }catch(Exception e){
            log.info("令牌非法,响应401");
            response.setStatus(HttpServletResponse.SC_UNAUTHORIZED);
            return;
        }
        //6.校验通过,放行
        log.info("令牌合法,放行");
        filterChain.doFilter(request,response);

        //7.删除ThreadLocal中的数据
        CurrentHolder.remove();
    }

}
